Call the callback given by the first parameter
Syntax
call_user_func(callable $callback, mixed ...$args): mixed
Parameters
callbackThe callable to be called.
argsZero or more parameters to be passed to the callback.
Note: Note that the parameters for call_user_func() are not passed by reference.
Return
Returns the return value of the callback.
Examples
1
<?
function myfunction()
{
return __FUNCTION__ . " Hello";
}
$callback = "myfunction";
$return = call_user_func($callback);
echo $return;
?>myfunction Hello
2
<?
function myfunction($arg)
{
return __FUNCTION__ . " $arg";
}
$callback = "myfunction";
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>myfunction Hello
3
<?
$function = function($arg)
{
return __FUNCTION__ . " $arg";
};
$callback = $function;
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>{closure} Hello4
<?
class myclass
{
static function myfunction($arg)
{
return __METHOD__ . " $arg";
}
}
$callback = "myclass::myfunction";
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>myclass::myfunction Hello
5
<?
class myclass
{
static function myfunction($arg)
{
return __METHOD__ . " $arg";
}
}
$callback = array("myclass", "myfunction");
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>myclass::myfunction Hello
6
<?
class myclass
{
static function myfunction($arg)
{
return __METHOD__ . " $arg";
}
}
$callback = array(new myclass(), "myfunction");
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>myclass::myfunction Hello
7
<?
namespace mynamespace;
class myclass
{
static function myfunction($arg)
{
return __NAMESPACE__ . " $arg";
}
}
$callback = __NAMESPACE__ . "\myclass::myfunction";
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>mynamespace Hello
8
<?
namespace mynamespace;
class myclass
{
static function myfunction($arg)
{
return __NAMESPACE__ . " $arg";
}
}
$callback = array(__NAMESPACE__ . "\myclass", "myfunction");
$args = "Hello";
$return = call_user_func($callback, $args);
echo $return;
?>mynamespace Hello
